Bill, your arguments regarding the difficulty or perceived difficulty of repairing or replacement of radiators are what have been proposed to NHRA in the past. Same argument for cylinder heads and other parts required of a stocker.
Thus far NHRA has resisted and requires full sized stock radiator for year / body type used.
Funny though, I still see the cross-breeding which defies this rule, i.e., late model Camaro radiators in early model Camaro's.
